ACT411 Rev 4, 27-Feb-14 TM ActivePSR Quasi-Resonant PWM Controller and overload conditions, it would enter auto restart FEATURES mode including cycle-by-cycle current limiting. Patented Primary Side Regulation ACT411 is to achieve no overshoot and very short Technology rise time even with big capacitive load (4000F) Quasi-Resonant Operation with the built-in fast and soft start process, . Adjustable up to 120kHz Switching The Quasi-Resonant (QR) operation mode can Frequency effectively improve efficiency, reduce the EMI noise and further reduce the components in input filter. +/-5% Output Voltage Regulation ACT411 is idea for application up to 36 Watt. Accurate OCP/OLP Protection Figure 1: Integrated Output Cord Compensation Simplified Application Circuit Integrated Line and Primary Inductance Compensation Built-in Soft-Start Circuit Line Under-Voltage, Thermal, Output Over- voltage, Output Short Protections Current Sense Resistor Short Protection Transformer Short Winding Protection Less than 100mW Standby Power Complies with Global Energy Efficiency and CEC Average Efficiency Standards Tiny SOT23-6 Packages APPLICATIONS AC/DC Adaptors/Chargers for ADSL, PDAs, E-books Adaptors for Portable Media Player, DSCs, and Other GENERAL DESCRIPTION The ACT411 is a high performance peak current TM mode PWM controller which applies ActivePSR TM and ActiveQR technology. ACT411 achieves accurate voltage regulation without the need of an opto-coupler or reference device. The ACT411 is designed to achieve less than 100mW Standby Power. By applying frequency fold TM back and ActiveQR technology, ACT411 exceeds the latest ES2.0 efficiency standard. ACT411 integrates comprehensive protection. In case of over temperature, over voltage, short winding, short current sense resistor, open loop TM www.active-semi.com Innovative Power - 1 - TM ActivePSR is a trademark of Active-Semi. Copyright 2014 Active-Semi, Inc. ACT411 Rev 4, 27-Feb-14 ORDERING INFORMATION TEMPERATURE PACKING OPTION (DC PART NUMBER PACKAGE PINS TOP MARK RANGE METHOD CORD %) ACT411US-T -40C to 85C SOT23-6 6 TUBE & REEL 3 FRYT PIN CONFIGURATION SOT23-6 ACT411US PIN DESCRIPTIONS PIN NAME DESCRIPTION Current Sense Pin. Connect an external resistor (R ) between this pin and ground to set peak CS 1 CS current limit for the primary switch. 2 GND Ground. 3 GATE Gate Drive. Gate driver for the external MOSFET transistor. 4 VDD Power Supply. This pin provides bias power for the IC during startup and steady state operation. 5 FB Feedback Pin. Connect this pin to a resistor divider network from the auxiliary winding. 6 COMP Compensation Pin. TM www.active-semi.com Innovative Power - 2 - TM ActivePSR is a trademark of Active-Semi. Copyright 2014 Active-Semi, Inc.